I have to throw my 2 cents in here as a parent of a 10 year old who is going on 26 lol. Children have an uncanny knack for sensing when something is going on - especially when it's something you don't want them to know about. My Husband and i frequently joke about my son having "ruin the kink radar" because if we were just lying there talking or wrestling, no boy. The second we got - well - grown up about things, there would be a knock on the door because he needed something. And another mood dies lol. As somebody said, the joys of having kids.
That being said, it is possible to play with your child at home (provided he/she is asleep and you have a private spot to do so) and i'd like to bring up a point here - what do you do when little ears overhear a piece of a scene and they want to know what you were doing in there?
There was an article on Red's Realm ages ago that dealt with this exactly. Basically, the response to the question is age appropriate - you're never going to come out and tell your kid in gory detail about the great scene you had last night, but shape the response to the age. A small child with big ears need only be told that mom and dad were playing "grownup games" while an older child might be told that while what they heard sounded a little scary (im assuming scene here lol can you tell?) that nothing happened that was not consensual and everything is still ok in your (the parent's) world.
Yes, a million times yes, being a kinky parent takes extra planning and some extra care, but it IS POSSIBLE to have a life with your children around, i promise!